Grinding medium mold

Abstract

The utility model relates to the technical field of dies, in particular to a grinding medium die. The grinding medium mold comprises a mold body, the mold body is provided with a cavity, the cavity is filled with medium powder, and the edges of the upper end face and the lower end face of the cavity are round edges. The mold body is provided with the cavity filled with the medium powder, and the edges of the upper end face and the lower end face of the cavity are round edges, so that stress generated in the forming process of the medium powder in the cavity is better released, the situation that the stress acts on corners of a green body to cause corner breakage is prevented, the product percent of pass is increased, abrasion of the cylindrical ceramic grinding medium is reduced, and the service life of the cylindrical ceramic grinding medium is prolonged. The wear resistance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and particularly relates to a grinding medium mold. Background Art

[0002] In the field of powder pressing and forming technology, cylindrical ceramic grinding media are a common product. And wear-resistant ceramic cylinders, as a kind of high-performance grinding media, play a crucial role in many industrial fields such as rubber vulcanization, ceramics, coatings, and mineral powders. With its unique physical properties and wide range of applications, it has become an indispensable grinding medium for fine grinding equipment such as ball mills and vibration mills. The manufacturing process of wear-resistant ceramic cylinders is very delicate. It is made by pressing high-purity powder into shape and then calcining at a high temperature of more than a thousand degrees Celsius. This manufacturing process ensures that the ceramic cylinders have a series of excellent characteristics such as low wear, high hardness, anti-abrasion, anti-impact, high strength, small size, high temperature resistance, and pollution-free. These characteristics make the wear-resistant ceramic cylinders perform well in improving the grinding efficiency of equipment and reducing the use cost.

[0003] For traditional cylindrical ceramic grinding media, the rigid mold wet isostatic pressing secondary forming process is adopted, that is, the granulated ceramic powder is pre-pressed into a cylindrical blank through a steel mold, the blank is placed on a sponge pad with round holes and slightly fixed in position, the sponge and the blank on it are bagged, evacuated and sealed, and then placed in a wet isostatic press, and uniform pressure is applied in all directions through the liquid. When the pressing is completed, the bag is removed and the blank is taken out from the sponge pad. However, this method has many procedures and requires a large amount of labor and time for placement, bagging, evacuation, and bag removal, resulting in low production efficiency and high production cost. And when the bag is removed, a large proportion (5%-10%) of the two ends' corners will be chipped, reducing the product qualification rate. The chipping of the ends' corners also increases the wear of the cylindrical ceramic grinding media and reduces the wear resistance. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is the defect that when the mold is unbagged in the prior art, the two ends' corners of the product will be chipped, reducing the product qualification rate. The chipping of the ends' corners also increases the wear of the cylindrical ceramic grinding media and reduces the wear resistance, so as to provide a grinding medium mold.

[0005] To solve the above problems, the utility model provides a grinding medium mold, including:

[0006] A mold body, the mold body is provided with a cavity, the cavity is filled with medium powder, and the edges of the upper and lower end faces of the cavity are configured as round edges.

[0007] Further, the upper and lower end faces and the circumferential side surface of the cavity are configured with arc surfaces protruding towards the outside of the cavity.

[0008] Furthermore, the mold body includes a top mold, a bottom mold and at least one middle mold. The middle mold is arranged between the top mold and the bottom mold. The bottom mold and the middle mold are provided with a plurality of cavities extending in the direction of gravity. The top mold, the middle mold and the bottom mold are detachably connected.

[0009] Furthermore, a sealing structure corresponding to each cavity is arranged on the end face of the top mold facing the middle mold, and the sealing structure is also arranged on the end face of the middle mold facing the bottom mold. The top mold and the middle mold seal the cavity through the sealing structure.

[0010] Furthermore, the cavity includes a first cavity groove and a second cavity groove. The first cavity groove is arranged on the end faces of the sealing structure facing the middle mold and the bottom mold, and the second cavity groove is arranged on the upper end faces of the middle mold and the bottom mold. The first cavity groove and the second cavity groove cooperate to form the cavity.

[0011] Furthermore, a matching part cooperating with the sealing structure is arranged at one end of the second cavity groove facing the first cavity groove.

[0012] Furthermore, the sealing structure and the matching part are of an inverted frustum structure.

[0013] Furthermore, a positioning round hole cooperating with the cylinder liner of the isostatic press is arranged at the bottom of the bottom mold.

[0014] Furthermore, the mold body is a rubber mold.

[0015] Furthermore, the round edge is R0.5 - R2.

[0016] The utility model has the following advantages:

[0017] The utility model discloses a grinding medium mold. The mold body is provided with cavities for filling medium powder. When the disclosed mold of the utility model is applied in a dry isostatic press, by constructing the edges of the upper and lower end faces of the cavity into round edges, the stress during the forming process of the medium powder in the cavity can be better released, avoiding stress concentration at the two ends and corners of the green body and causing the situation of corner chipping. Furthermore, the product qualification rate is improved, the wear of the columnar ceramic grinding medium is reduced, and the wear resistance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 This is a schematic diagram of the grinding medium mold in the embodiment of the present utility model;

[0020] Figure 2 This is a cross-section of the grinding medium mold in the embodiment of the present utility model Figure 1 ;

[0021] Figure 3 This is a cross-section of the grinding medium mold in the embodiment of the present utility model Figure 2 ;

[0022] Explanation of reference numerals:

[0023] 1, cavity; 2, round edge; 3, top mold; 4, bottom mold; 5, middle mold; 6, arc surface; 7, sealing structure; 8, first cavity; 9, second cavity; 10, mating part. Detailed implementation manners

[0024] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] As shown Figures 1 to 3 in the figure, this embodiment discloses a grinding medium mold, including: a mold body. The mold body is provided with a cavity 1, the cavity 1 is filled with medium powder, and the edges of the upper and lower end faces of the cavity 1 are configured as rounded edges 2.

[0029] Specifically, the mold body is provided with a cavity 1, the medium powder is filled in the cavity 1, and the edges of the upper and lower end faces of the cavity 1 are configured as rounded edges 2. During the molding process, the mold shrinks under pressure, causing the cavity 1 to shrink and extrude the medium powder, so that the medium powder is forced to form a green body. The stress generated during the molding process will be released from the rounded edges 2, preventing the stress from acting on the corners of the green body and causing corner chipping.

[0030] Furthermore, the mold body includes a top mold 3, a bottom mold 4 and at least one middle mold 5. The middle mold 5 is arranged between the top mold 3 and the bottom mold 4. The bottom mold 4 and the middle mold 5 are provided with a plurality of cavities 1 extending along the gravity direction. The top mold 3, the middle mold 5 and the bottom mold 4 are detachably connected.

[0031] Specifically, as Figure 1 and Figure 2 shown in the figure, the mold body includes a top mold 3, a bottom mold 4 and at least one middle mold 5. The middle mold 5 is arranged between the top mold 3 and the bottom mold 4. The middle mold 5 and the bottom mold 4 are provided with a plurality of cavities 1 extending along the gravity direction. The upper end face of the uppermost middle mold 5 is attached to the lower end face of the top mold 3, the lower end face of the lowermost middle mold 5 is attached to the upper end face of the bottom mold 4, and the upper and lower end faces of adjacent middle molds 5 are attached to each other. The number of middle molds 5 can be increased or decreased according to the inner clearance height of the cylinder liner of the dry isostatic press and the number of required green bodies. The top mold 3, the middle mold 5 and the bottom mold 4 are detachably connected, so as to facilitate the disassembly or addition of the middle mold 5, and at the same time facilitate the demolding of the green body. The grinding medium mold disclosed in this embodiment can mass-produce green bodies and improve production efficiency.

[0032] Furthermore, the upper and lower end faces and the peripheral side surface of the cavity 1 are configured with arc surfaces 6 protruding outward from the cavity 1.

[0033] Specifically, as Figure 3 shown in the figure, the upper and lower end faces and the peripheral side surface of the cavity 1 have arc surfaces 6 protruding outward from the cavity 1, so that the cavity 1 is configured as a quasi-cylindrical structure. If the cavity 1 is configured as a regular cylindrical structure, during the molding process, the mold is pressed to cause the cavity 1 to shrink and extrude the medium powder, resulting in defects such as waist shrinking on the side and depression at both ends of the green body. In this embodiment, the upper and lower end faces and the peripheral side surface of the cavity 1 are configured with arc surfaces 6 protruding outward from the cavity 1. Thus, during the molding process, the upper and lower end faces and the peripheral side surface of the cavity 1 will absorb a part of the stress, and the green body can be pressed into a regular cylinder, avoiding defects such as waist shrinking on the side and depression at both ends.

[0034] Furthermore, a sealing structure 7 corresponding to the cavity 1 one by one is arranged on the end face of the top die 3 facing the middle die 5, and a sealing structure 7 is also arranged on the end face of the middle die 5 facing the bottom die 4. The top die 3 and the middle die 5 are sealed by the sealing structure 7 to form the cavity 1.

[0035] Specifically, as Figure 2 and Figure 3 shown, sealing structures 7 corresponding to the cavity 1 one by one are arranged on the lower end faces of the top die 3 and the middle die 5. The sealing structure 7 can seal the cavity 1, and at the same time, the sealing structure 7 can play a role in guiding and positioning the top die 3 and the middle die 5.

[0036] Furthermore, the cavity 1 includes a first cavity groove 8 and a second cavity groove 9. The first cavity groove 8 is arranged on the end faces of the sealing structure 7 facing the middle die 5 and the bottom die 4, and the second cavity groove 9 is arranged on the upper end faces of the middle die 5 and the bottom die 4. The first cavity groove 8 and the second cavity groove 9 cooperate to form the cavity 1.

[0037] Furthermore, a matching part 10 cooperating with the sealing structure 7 is arranged at one end of the second cavity groove 9 facing the first cavity groove 8.

[0038] Specifically, as Figure 3 shown, the first cavity groove 8 is arranged on the end face of the sealing structure 7 facing the second cavity groove 9, and a matching part 10 is arranged at one end of the second cavity groove 9 facing the first cavity groove 8. The sealing structure 7 can be inserted into the matching part 10 so that the first cavity groove 8 and the second cavity groove 9 are combined to form the cavity 1.

[0039] Furthermore, as Figure 3 shown, the sealing structure 7 and the matching part 10 are frustum structures. The sealing structure 7 is inserted into the matching part 10 and has a clearance fit with the matching part 10.

[0040] Furthermore, a positioning round hole (not shown) cooperating with the cylinder sleeve of the isostatic press is arranged at the bottom of the bottom die 4. The bottom die 4 is arranged in the cylinder sleeve of the isostatic press through the positioning round hole.

[0041] Furthermore, the mold body is a rubber mold.

[0042] Furthermore, the round edge 2 is R0.5 - R2. Preferably, in this embodiment, the round edge 2 is R1.

[0043] In the grinding medium mold of this embodiment, the medium powder is filled in the second cavity 9 of the middle mold 5 and the bottom mold 4. The middle mold 5 is arranged on the top of the bottom mold 4. The sealing structure 7 on the lower end face of the middle mold 5 is inserted into the mating part 10 of the second cavity 9 on the bottom mold 4 to seal the second cavity 9 on the bottom mold 4. At the same time, the first cavity 8 on the lower end face of the middle mold 5 and the second cavity 9 on the bottom mold 4 are combined to form a cavity 1. The sealing structure 7 on the lower end face of the top mold 3 is inserted into the mating part 10 of the second cavity 9 on the middle mold 5 to seal the second cavity 9 on the middle mold 5. At the same time, the first cavity 8 on the lower end face of the top mold 3 and the second cavity 9 on the bottom mold 4 are combined to form a cavity 1.

[0044] By means of the grinding medium mold disclosed in this embodiment, by constructing the edges of the upper and lower end faces of the cavity 1 as rounded edges 2, the stress generated during the molding process can be released from the rounded edges 2, preventing the stress from acting on the corners of the green body and causing corner chipping. At the same time, the upper and lower end faces and the peripheral side surface of the cavity 1 are constructed as arc surfaces 6 protruding outward from the cavity 1. Thus, during the molding process, the upper and lower end faces and the peripheral side surface of the cavity 1 will absorb a part of the stress, and the green body can be pressed into a regular cylinder, avoiding defects such as waist shrinkage on the side and depression at both ends, and better ensuring the integrity and qualification rate of the green body. By setting at least one middle mold 5 and arranging a plurality of cavities 1 on the middle mold 5 and the bottom mold 4, the production quantity can be effectively increased, which is suitable for large-scale production.

[0045] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A grinding medium mold, characterized in that, Comprising: A mold body, the mold body is provided with a cavity (1), the cavity (1) is filled with dielectric powder, and the edges of the upper and lower end faces of the cavity (1) are configured as rounded edges (2); The mold body includes a top mold (3), a bottom mold (4) and at least one middle mold (5), the middle mold (5) is arranged between the top mold (3) and the bottom mold (4), the bottom mold (4) and the middle mold (5) are provided with a plurality of the cavities (1) extending in the direction of gravity, the top mold (3), the middle mold (5) and the bottom mold (4) are detachably connected, the end face of the top mold (3) facing the middle mold (5) is provided with a sealing structure (7) corresponding to the cavity (1) one by one, and the end face of the middle mold (5) facing the bottom mold (4) is also provided with the sealing structure (7), and the top mold (3) and the middle mold (5) seal the cavity (1) through the sealing structure (7).

2. The abrasive medium mold according to claim 1, wherein: The upper and lower end faces and the circumferential side face of the cavity (1) are configured with arc surfaces (6) protruding outward from the cavity (1).

3. The abrasive medium mold according to claim 1, wherein: The cavity (1) includes a first cavity (8) and a second cavity (9), the first cavity (8) is arranged on the end faces of the sealing structure (7) facing the middle mold (5) and the bottom mold (4), the second cavity (9) is arranged on the upper end faces of the middle mold (5) and the bottom mold (4), and the first cavity (8) and the second cavity (9) cooperate to form the cavity (1).

4. The abrasive medium mold according to claim 3, wherein: One end of the second cavity (9) facing the first cavity (8) is provided with a cooperating portion (10) cooperating with the sealing structure (7).

5. The abrasive medium mold according to claim 4, wherein: The sealing structure (7) and the cooperating portion (10) are frustum structures.

6. The abrasive medium mold according to any one of claims 3-5, wherein: The bottom of the bottom mold (4) is provided with a positioning round hole for cooperating with the isostatic press cylinder sleeve.

7. The abrasive medium mold according to claim 6, wherein: The mold body is a rubber mold.

8. The abrasive medium mold according to claim 1, wherein: The rounded edge (2) is R0.5-R2.

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